Filtering apparatus.



P. 0 c. ISHERWOOD.

PILTERING APPARATUS. APPLICATION FILED FEB. 18, 1910.

Patented Nov. 12, 1912.

Invntor Witnesses- Attorney.

. solutions of substances such l "UNITED fiTATEd PATENT QFI lQE,

PERCY CLAUDE CAMERON ISHERWOOD OF LEYTONSTO'NE, ENGLAND, ASSIGNOR TO REFRACTORY ZINC ORE TREATMENT COMPANY, A CORPORATION OF NEW YORK..

FILTERING APPARATUS.

' Application This invention relates to apparatus for fil tering and especially for the filtration of as refractory zinc lead ores which crystallize on reduction of the temperature or pressur under which they have been dissolved.

According to the invention I provide means whereby the filtration shall be quickly eii'ected under heat and under pressure and in such manner that premature crystallization of the dissolved compounds and the b choking of the filter are avoided.

According to the invention moreover I provide a vessel capable of being tightly closed by means of a cover plate and I provide the vessel so that in its upright position the extraction or other treatment may take place, and so that it may be turned upside down with the filterplate lowermost, for the purpose of filtering the charge, so that thus the coarser particles of the charge come to lie upon the filter plate.

he invention is illustrated in the accompanying drawing which is a sectional elevation of the filtering pot or vessel.

Incarrying the invention into effect in the construction of a or vessel or advantageously having a curved bottom a and an open top carrying a surrounding fiange a upon which a cover plate 6, advantageously of curved form, may be mounted and be capable of being bolted to the flange a? of the pot or vessel so that the material may be treated under pressure therein.

The top face of the pot or vessel isadvantageous'ly recessed as shown at a for the reception of the filter plate 0 which conveniently may be constituted of a number of layers, that is to say, a layer of wire gauze, a layer of filtering material and a erforated supporting plate, all the layers being advantageously of the same size and extending over the mouth of the pot or vessel Specification of Letters Patent. filed February is, 1910. I Serial No.

and having their shown at f, and a due and filterplate filter, I provide a pot a hollow space above ,tering means at Patented Nov. 12, 1912. 544,651.

edges lying in the recess provided for their reception in which they down the liquor may pass out.

At the lower part of the vessel 1 advantageously provide a blade or stirrer .2 mounted upon a spindle e which extends outwardly "and is capable of rotation so that the charge may be well stirred applied to the bottom of the potor vessel as I I pressure gage 9 provided on the side of the vessel permits of the heating being effected to the necessary determined pressure. After extraction the pot or vessel is turned upon trunnions it that may e provided for the purpose, so that the whole charge is then supported by the filter plate 0 and on the outlet cock- 0? being opened the solution will be forced through theresiby the internal pressure corresponding to the temperature towhich the liquor has been previously heated, whereby the filtration is quickly effected.

It will be understood that the invention is not limited to the particular form of the vessel hereinbefore described nor is it confined to any particular means of heating the charge. Any means ofheating may be employed such for example as a gas or liquid fuel burner, or the heating may be effected by steam under pressure passed through coils of piping or a jacket surrounding the vessel, or steam already at the requisite l pressure may be passed through the charge.

lVhat I claim as my invention and desire to secure by Letters Patent'is:-

1. Filtering apparatus comprising a vessel having a curved bottom and open top, filtering means at the upper end of the vessel, a cover of curved form so as to provide a the filtering means, stir"- ring means within the lower part of the vessel and means for rotating the vessel.

2. Filtering apparatus comprisinga vessel having a curved bottom and open top, "the upper end of said vessel being recessed, fil

the upper end of the vessel, said filterlng means being disposed within the recessed part of the vessel, a curved cover .soas to provide a hollow space above cover of curved form so as to provide a h0lthe filtering means, and means for rotating low space abovethe filtering means, and

the vessel. I means for rotating the vessel.

3. Filtering apparatus comprisingavessel In testimony whereof I have hereunto upper part of the vessel being recessed, filpresence of two subscribing witnesses.

tering means at the upper end of the vessel, PERCY CLAUDE CAMERON ISHERWOOD. said filtering means being disposed Within \Vit-nesses:

the recessed part of the vessel, stirring LIONEL ERNEST BUssEY,

10 means Within the lower part of the vessel, a H. D. J AMESON.

copies of this patent niay be obtained for five centseach, by addressing the Commissioner of Patents,

' Washington, D. 0.

having a curved bottom andopen top, the signed my name to this specification in the 15 

